#include <iostream>

using namespace std;

class Circle {
private:
    int radius;
public:
    static const double PI;
    Circle(int radius){
        this->radius = radius;
    }

    int getRadius() {
        return radius;
    }

    void setRadius(int radius) {
        this->radius = radius;
    }

    void calculateArea(){
        double area;
        area = PI*radius*radius;
        cout<<"area:"<<area<<endl;
    }
    void calculatePerimeter(){
        double perimeter;
        perimeter = 2*PI*radius;
        cout<<"perimeter:"<<perimeter<<endl;
    }

};
const double Circle::PI = 3.1415926;
int main()
{
        Circle Circle1 (7);
        Circle1.calculateArea();
        Circle1.calculatePerimeter();
}
